Single-trigger mechanism.



P. H. ROBINSON.

SINGLE TRIGGER MECHANISM.

APPLICATION FILED FEB. 8, 1909.

Patented Oct. 26, 1909.

3 SHEETS-SHEET 1.

Q Viimcomzo Q (iflbemtoz I @514 I fitter/meg;

P. H. ROBINSON.

SINGLE TRIGGER MECHANISM.

APPLICATION FILED FEB. e, 1909.

937,864. Patefited 0013.26, 1909.

3 SHEETS-SHEET 2.

In 1 I I M iv! M AITLIG ATION FILED FEB. 8, 1909.

P. H. ROBINSON.

SINGLE TRIGGER MECHANISM.

3 SHEB'Is-SHEET 3.

IIDREWJL emu 00., Pmmurmuruina wlsmqemn. D. u.

PEARL H. ROBINSON, OF SHELTON, CONNECTICUT.

SINGLE-TRIGGER MECHANISM.

Specification of Letters Patent.

Patented Oct. 26, 1909.

Application filed February 8, 1909. Serial No. 476,788.

T 0 all whom it may concern:

Be it known that I, PEARL H. ROBINSON, a citizen of the United States,residing at Shelton, county of Fairfield, State of Connecticut, haveinvented a new and useful Single-Trigger Mechanism, of which thefollowing is a specification.

This invention relates to the trigger mechanism of fire arms and hasparticular reference to such mechanism for double barreled shot guns,especially such as employ a single trigger for actuating both hammers.

One of the objects of my invention is to prevent an involuntary pull,due to the recoil from the discharge of one barrel, from having theeffect of automatically discharging the other barrel.

Other objects of the invention are to provide an improved escapementmechanism which performs the function above mentioned; to provide animproved firing lug block which is pivoted instead of being an ranged asa slide; to provide means whereby the user of the gun can determine bysense of touch which barrel has beendischarged or is next to bedischarged; and to provide various improved details of constructiontending to improve and simplify the construction and operation of thetrigger mechanism and to reduce the cost thereof.

To these ends the invention consists in the construction and combinationof parts substantially as hereinafter described and claimed. 7

Of the accompanying drawings :Figure 1 is a sectional side elevation ofa portion of agun embodying my improvement. Fig. 2 is a detail plan ofthe under plate and the parts immediately carried thereby. Figs. 3 and4: are detail views similar to a portion of Fig. 2 but on a largerscale, illustrating the different positions to which the firing lugs maybe shifted for controlling the sear which is'to be first actuated. Fig.5 is a 7 detail plan view from the under side, of the finger piece forshifting the firing lug" block. Fig. 6 represents a detail section online 6-6 of Fig. 7, looking in the direction of the arrow, but showingalso in section a portion of the under plate which latter does notaptive positions occupied by them when in normal position ready fordischarging the first barrel, one of the arms of the hooked slide beingshown as broken. Fig. 8 is a detail side elevation of parts of the mechanism shown in Fig. 7 but with said parts in the relative positionswhich they occupy when the trigger is first shifted for firing butbefore a hammer has been released. Fig. 9 is a view similar to Fig. 8but showing the parts in their positions at the time of discharge of thefirst barrel. Fig. 10 is a similar view showing the parts in theirpositions due to the involuntary release following the discharge of thefirst barrel. Fig. 11 is a similar view showing the parts in theirpositions after voluntary release and when the second barrel is ready tobe fired.

Similar reference characters indicate the same or similar parts in allof the views.

The stock of the gun is indicated at 15 and the barrel portion at 16,the latter being pivoted at 17 to a block 18 carried by the stock. Thehammers 19 occupy recesses in the block 18 and are actuated by springs20 through the medium of the customary plunger and strut or link.

The hook slide 21 is connected by a bellcrank 22 with a hook 23 on theunder side of the barrel to provide means for cooking the hammers whenthe barrel is swung on its pivot for loading. The sears 24 and 25 areactuated by springs 26 to cause their forward ends to engage the hammerswhen the latter are cooked. As is usual with mechanism similar to'whathas been so far described, raising the rear end of either of the sears,releases the corresponding hammer.

Any suitable means may be employed for locking the barrel when the gunis closed. A well known form of such means includes a rock shaft 31 anda finger lever 33. To

avoid confusion, I have not attempted toillustrate further details ofsuch well known barrel lock. All of the mechanism so far described is ofa well known form.

The under plate 34 of the gun lock mechanism has a housing 35 whichreceives the threaded lower end of a bolt 37 the head of which isrecessed in the to plate 36. The trigger 38 is pivoted at 39 in thehousing. Also mounted on the pivot 39 is a block 40 which I shall referto asthe trigger body because its oscillations are effected by thetrigger although the latter has a slight oscillating movement on thepivot 39 relatively to said body as will readily be seen by comparingFigs. 7 and 8. One end of the trigger body which I shall refer to as thefront end or tip has its upper surface concave as at 41, the point ofjunction of said concave surface with the front or upright wall forminga tooth 42. The trigger itself extends through an opening 43 in thetrigger body and is provided at its front end or tip with a finger 4dthe lower surface of which is slightly convex. The normal slight spaceexisting below the finger lt as shown in Fig. 7 permit-s the trigger tohave a slight independent movement on its pivot before said fingercontacts with the surface 41 to oscillate the trigger body, the objectof which construction will be hereinafter explained.

Mounted on the top of the trigger body is a member which I shall referto as the cocking slide 45. Said slide is slotted or bifurcated to formtwo arms which pass forward along the sides of the trigger tip, the endsof said arms being formed with downwardly turned lugs 46 which areadapted to be engaged by upwardly turned lugs 47 at the ends of arms 48(see Fig. 2) which are integral with, or rigidly connected to, thehooked slide 21 so that when the barrel is swung on its piovt forloading and the slide 21 is pulled forward, the said lugs 47 engage thelugs 16 and pull the cocking slide forward resulting in setting saidcocking slide in the position shown in Figs. 7 and 8. Said figureshowever show the slide 21 and its arms 48 and lugs 27 as retracted, butthis is because the parts of the gun have been restored with the barrellocked for firing which actof restoring puts the said slide 21 in theposition shown in said Figs. 7 and 8.

I will now describe how the forward movement of the cooking slide to putit in the position of Figs. 7 and 8, sets the firing lug :The triggerbody 40 is formed with a vertical slot 49 through which a pin 50 extendsdownward from the cooking slide, said pin being secured to the slide andhaving its lower end fitted in an opening in the top of a sliding tube51 mounted in a longitudinal cylindrical opening or bore 52 in thetrigger body. This structure insures that the sliding tube 51 mustalways reciprocate with the cooking slide 45. Mounted vertically in andtransversely of said tube 51 is a rock shaft or pin which extendsthrough slots in the trigger body above and below. Secured to orintegral with the upper end of said pin 53 is the firing block havingtwo lugs 54 and 55 preferably formed as best indicated in Figs. 3 and 4which lugs are respectively adapted to actuate the sears 24 and 25 in amanner hereinafter described. The portions of the pin which pass throughthe tube 51 are circular and fit corresponding openings in said tube.But the intermediate portion of said pin is square as at 56, and againstopposite sides of this squared portion spring plungers bear in order tohold said rock shaft or pin and the firing lug in either the full lineor the dotted line positions of Figs. 3 and 4:. Said spring plungers areindicated at 57, the same having faces or heads which bear againstopposite fiat faces of the portion 56, and stems which are surrounded bysprings 58 and 59. The other end of the spring 59 bears against aplunger 60 which in turn bears against a portion of the trigger tonormally hold the trigger and trigger body in the relative positionsshown in Fig. 7. Secured to the lower end of the rock shaft or pin 53 isa finger piece having two arms or buttons (51 and 62. A small slide 63through which the pin 53 passes, prevents access of foreign matterthrough the slot in the trigger body.

It will now be readily understood that the person using the gun canoscillate the rock shaft or pin 53 by means of either of the buttons(31, 62, so as to turn the pin and set the firing block in either of thepositions shown by full and dotted lines in Figs. 3

v and 4. The arrangement is such that when one button projects to theright of the trigger, the firing lug is in position so that when thetrigger body is oscillated, the lug member 55 will be under the righthand sear 25 and fire the right hand barrel first. Of course a secondoperation of the trigger without shifting the firing lugs will result inactuating the left hand sear and firing the left barrel all as will morefully appear hereinafter. By actuating either button so that one willproject to the left of the trigger, the firing lugs are shifted to suchposition that the first movement of the trigger will discharge the lefthand barrel. Therefore the user can always tell either by the sense ofsight or touch which of the two barrels is to be fired.

To hold both the trigger and the trigger body normally in the positionshown in Fig. 7, I employ a spring pressed plunger 64 wvhich bears onthe cooking slide back of the pivot 39 of the trigger and trigger body.Said plunger is actuated by a spring 65 mounted in a recess 66 in thelower end of the connecting bolt 37, the plungerG l reciprocating in thelower portion of said recess and projecting therefrom. Said plunger hasan elongated bearing portion 67 in the recess so that said plunger willnot be deflected as the cocking slide reciprocates under it.

The spring 59 possesses two functions. As has been described it causesthe plunger 00 to bear against a portion of the trigger so as tonormally hold it in the position shown in Fig. 7 relatively to thetrigger body. Since the other end of said spring bears against one ofthe plungers which, in turn, bears against a fiat portion of the rockshaft or pin 53, said spring tends to force rearwardly the said rockshaft or pin and the firing lug or lugs, the sliding tube 51, the pin 50and the cocking slide 45. But when the parts are in the normal positionready for discharging the first barrel, as shown in Fig. 7 this rearwardmovement of the sliding tulge and the firing lug is prevented by thefront wall of the tooth 42 of the trigger body being in the path ofrearward movement of the lugs 46 of the cocking slide. Before saidcocking slide and the firing lugs can be shifted'rearwardly, thisengagement of the lugs 46 with the tooth 42 must be displaced. Such adisplacement however must not occur until after the first barrel hasbeen discharged. I will now describe the successive steps of thisoperation.

Assuming that the parts are in the position shown in Fig. 7, and thatboth barrels of the gun have been loaded and returned to closed andlocked position, the first movement of the trigger 38 closes the finger44 down upon the concave surface 41 of the trigger body as shown in Fig.8. This first movement of the trigger may be called a free one as itdoes not oscillate the trigger body. It does however bring the frontwall of a wide portion of the trigger above the finger 44 down behindthe rear wall of teeth 460 which project toward each other from the lugs46 as shown in Figs. 2 and 6. At this time, the tooth portion 42 of thetrigger body is behind the tooth portions 460 of the cocking slide andconsequently the cocking slide and the firing lugs are prevented frombeing shifted rearward by the spring 59. Further movement of the fingeragainst the trigger causes the trigger body to oscillate with thetrigger on the pivot 39, this movement continuing until the tooth 42 ofsaid trigger body passes below the teeth 460, this latter positionhaving been almost reached in Fig. 8, and completely reached in Fig. 9.This elevates the rear end of the trigger body and causes one of thescars to be actuated by its proper firing lug, so that the first barrelis discharged. When the trigger body has been shifted sufiiciently torelease the cocking slide teeth 460, the spring 59 will be exerting itsforce to carry said cocking slide rearwardly. But as has been described,it can not yet pass rearwardly because of the wide portion of thetrigger above the finger 44 being behind the teeth 460 as shown in Fig.9. The recoil due to the discharge of the first barrel, involuntarilycauses the release of the trigger to the position shown in Fig. 10, andthe resulting rebound causes the trigger to shift back to the positionshown in Fig. 9 but since the users finger on the trigger will stillinvoluntarily keep the end of the finger 44 in contact with the surface41 of the trigger body, the cooking slide cannot move rearwardly becausethere is insufiicient space to enable the teeth 460 to pass between thetooth 42 and the wide portion of the trigger. But upon voluntary releaseof the trigger, the trigger body will be shifted entirely back to normalposition partly by the spring pressure of the lifted sear and partly bythe pressure of the spring pressed plunger 64. The final movement due tothe voluntary release causes the trigger finger 44 to lift again to theposition shown in Fig. 7 and leaves a space then through which the teeth460 can pass so that the spring 59 shifts the sliding tube rearwardly soas to carry the firing lugs and the cocking slide to the position shownin Fig. 11, this being the position in which the firing lugs occupy thepositions relatively to the sears shown in Fig. 4 so that a secondactuation of the trigger will discharge the left hand barrel.

The rear end of the trigger body is provided with an upturned ear or lug71 which is adapted to cooperate with the tip of a lever 72 of anordinary safety equipment the details of which need not be described asthe same forms no part of this invention. It is sufiicientto state thatwhen the lever 72 is shifted to a position so that its tip is above theear or lug 71, the gun cannot be fired because the trigger body cannotthen be oscillated by the trigger.

Having now described my invention, what I claim is 1. A double-b-arreledgun having upper and lower plates and a connecting bolt, said bolthaving a recess, a cooking slide, and a spring actuated plunger mountedin the recesg, of the bolt and bearing on said cocking sli e.

2. A double-barreled gun comprising in its construction a trigger andtrigger body pivotally mounted concentrically, said trigger and bodyhaving co-acting escapement teeth, and a cocking slide having portionsto engage said teeth.

3. A double-barreled gun comprising in its construction a housing, apivot supported by said housing, a trigger and trigger body mounted onsaid pivot and having co-acting escapement teeth, and a cocking slidehaving portions to engage said teeth.

4. A double-barreled gun comprising in its construction a trigger andtrigger body pivotally mounted concentrically, said body having a toothat its front end and concaved behind said tooth, the triggerhaving afinger formed with a convex surface, and a cooking slide having portionsadapted to alternately engage the tooth of the trigger body and thefinger of the trigger.

5. A double-barreled gun comprising in &

its construction a trigger and trigger body pivotally mountedconcentrically, said body having a tooth at its front end and concavedbehind said tooth, the trigger having a finger formed with a convexsurface, and a cocking slide having portions adapted to alternatelyengage the tooth of the trigger body and the finger of the trigger, saidtrigger and trigger body being relatively mounted to permit a space tobe provided between said concave and convex surfaces.

6. A double-barreled gun comprising in its construction a trigger andtrigger body pivotally mounted concentrically, said trigger and bodyhaving co-acting escapement teeth, and a cocking slide having armsextending along the sides of the trigger tip and having teeth to co-actwith portions of the trigger and trigger body to constitute anescapement.

7. A double-barreled gun comprising in its construction a trigger andtrigger body pivotally mounted concentrically, a hooked slide havingarms provided with upwardly turned lugs, and a cocking slide havingdownwardly turned lugs to be engaged by said upwardly turned lugs of thehooked slide, said cocking slide having also teeth to co-act withportions of the trigger and trigger body to constitute an escapement.

8. In a double-barreled gun, a trigger body having a vertical slot and alongitudinal bore, a cocking slide on said body, a slidingly mountedmember in said bore, a pin passing through the slot of the trigger bodyand connecting said cocking slide and sliding member, and a firing blockoperatively connected with said sliding member.

9. In a double-barreled gun, a trigger body having a vertical slot and alongitudinal bore, a cocking slide on said body, a tube slidinglymounted in said bore, a pin passing through the slot of the trigger bodyand connecting said cocking slide and tube, and a firing blockoperatively connected with said tube.

10. In a double-barreled gun, a trigger boc y having a longitudinalbore, a yield ingly mounted slide in said bore, a firing block havinglugs pivotally mounted in said slide, and a cocking slide operativelyconnected with the first mentioned slide.

11. In a double-barreled gun, a trigger body having a longitudinal bore,a tube mounted in said bore, a rock shaft mounted transversely of saidtube and having firing lugs at one end, and means for holding said rockshaft in either one of two positions.

12. In a double-barreled gun, a trigger body having a longitudinal bore,a tube mounted in said bore, a rock shaft mounted transversely of saidtube and having firing lugs at one end, and means for holding said rockshaft in either one of two positions,

said means comprising plungers having fiat faces and springs forpressing said plungers against the rock shaft, the latter having fiatportions to co-act with the fiat faces of the plungers.

13. In a double-barreled gun, a trigger body having a longitudinal bore,a tube mounted in said bore, a rock shaft mounted transversely of saidtube and having a block at one end said block being formed with two lugsprojecting in opposite directions from the axis of said rock shaft, andmeans for holding said rock shaft in either one of two positions.

14. In a double-barreled gun, a trigger body having a longitudinal bore,a tube mounted in said bore, a trigger pivoted relatively to saidtrigger body, a plunger projecting from one end of said tube and bearingagainst the trigger, a rock shaft mounted transversely of said tube andhaving firing lugs at one end, and means for holding said rock shaft ineither one of two positions, said means including a spring forprojecting said plunger against the trigger.

15. In a double-barreled gun, a trigger and trigger body pivotallymounted concentrica'lly, a spring actuated plunger mounted in said bodyand bearing against the trigger, said trigger and trigger body havingco-acting escapement portions, and a cocking slide controlled by saidescapement portions.

16. In a double-barreled gun, a trigger body having a rock shaft mountedtherein, said rock shaft having a block formed with firing lugs at oneend, and a finger piece at the other end of said rock shaft, said fingerpiece having two arms.

17. In a double-barreled gun, a trigger body having a rock shaft mountedtherein, said rock shaft having a block formed with firing lugs at oneend, and a finger piece at the other end of said rock shaft, said fingerpiece having two arms substantially at a right angle to each other andin a direction to enable one arm to project to the right, or the otherarm to project to the left.

18. In a double-barreled gun, a trigger body having a rock shaft mountedtherein, said rock shaft having a block at one end and a finger piece atthe other end, said block being formed with firing lugs extending inopposite directions from the axis of the rock shaft, said finger piecehaving two arms at substantially a right angle to each other.

19. In a double-barreled gun, the combination with upper and lowerplates, of a housing carried by the lower plate, a bolt connecting theupper plate and housing, a trigger and trigger body pivotally mounted insaid housing forward of the said connecting bolt, a spring mounted insaid connecting bolt, and means whereby the pressure of said spring istransmitted to the trigger body.

20. In a double-barreled gun, the combination with upper and lowerplates, of a housing carried by the lower plate, a bolt connecting theupper plate and housing a trigger and trigger body concentricallypivoted "in said housing forward of the said connecting bolt, a springpressed plunger mounted in said connecting bolt for holding the triggerbody in normal position, and independent spring actuated means forholding the trigger in normal position relatively to said trigger body.

21. In a double-barreled gun, the combi-

